I'm of the opinion that I'd rather have a partial feature set of a program to try it out, than to have a full featured one that is ad supported. I absolutely hate advertisements, and 90% of the time if I see a program or application that is somehow ad supported, I remove it immediately. I usually don't suffer this that much, since I bought a Nokia N9, after being fed up with the whole Android / Google thing.

But there are still a few apps out there that insist on being ad-supported. It's especially terrible if you don't have unlimited data.